Fate/Zero aired as a split cours, so seasons 1 and 2 should be combined into one single season according to the submission guidelines: https://www.themoviedb.org/bible/tv/59f743289251416e71000037?language=en-US#5b71c6b4c3a3684161000001
Sources:
https://www.fate-zero.jp/story/index.html (Episodes go from #1 - 25)
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Elementu hau kalifikatu edo zerrenda batera gehitzea nahi al duzu?
Ez zara kidea?
Banana Erabiltzailearen Erantzuna
Uztaila 23, 2019 egunean 10:57 PM(e)tan
Hi! You are correct, it should only be one season. I can't merge the two seasons myself, but we're building a list of incorrectly split anime series that will eventually be fixed byTravis.